Three riddles - one answer

I am a big fan of medieval riddles - I enjoy the challenge in answering them. They can sometimes be easy, but others tricky. They do tell us a lot about how past societies thought of everyday objects and how they enjoyed wordplay. Recently, I came across three riddles recorded in Mark Byrant’s Dictionary of Riddles, published in 1990. Two date from the Middle Ages, and one is from a more modern time. The first riddle can be found in The Saga of Hervör and Heidrek, a thirteenth-century Scandinavian saga:

What is the marvel which I have seen outside Delling’s doorway? It flies high, with a whistling sound like the whirring of an eagle. Hard it is to clutch.

The second riddle comes from the fourteenth century, as the Czech monk Claretus came up with this:

What flies without flesh?

The final riddle comes from an 18th-century book called Whetstone for Dull Wits:

By sparks in fine lawn I am lustily drawn, But not in a chariot or coach; I fly, in a word, More swift than bird, That does the green forest approach.

What connects these three riddles? The answer is the answer, which in this case is an arrow.